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In vivo experiments have found that animals encode their current location through spatial neurons (such as grid cells, place cells, border cells, head-direction cells, and so on) that are usually classified according to their functions (or firing patterns). And in vitro experiments revealed that there are two types of excitatory neurons within medial entorhinal cortex according to their structural characteristics: stellate cells and pyramidal cells. It is still unclear that how neuronal types with different functions correspond to multiple structural types. Previous researches have modeled spatial neurons primarily according to their functional type. In this paper, we attempt to model spatial neurons according to their structural type and propose computational models of stellate cells in layer II of medial entorhinal cortex. We use leaky integrate-and-fire (LIF) neurons to model the soma of stellate cells which are driven by feedforward excitatory current inputs. To obtain this drive current, up-stream velocity-controlled oscillators (VCOs) are used, and the output of VCOs is encoded using an inverse hexagonal discrete Fourier transform (IHDFT). At the same time, this current is regulated by a local recurrent network consisted of stellate cells and interneurons and by backprojection signals from down-stream hippocampus. Simulation results demonstrate that our model generates grid-like and border-like firing patterns. Our model explains the causes of stellate cell discharge activity and gives a new direction for modeling spatial neurons. © 2021 IEEE
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Year: 2021
Page: 8200-8207
Language: English
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 4
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